Hi, The following minimal example:
================================== \starttext \chemical{A,+,B,<->,AB} \stoptext ================================== gives the following error under context version: 2011.10.08 11:42, luatex version beta-0.70.1-2011051918: ! Undefined control sequence. system > tex > error on line 10 in file test.tex: Undefined control sequence ... 1 \starttext 2 3 \chemical{A,+,B,<->,AB} 4 5 \stoptext 6 <argument> \xrightpverleftarrow {}{} \mathematics ...mmode #1\else \normalstartimath #1 \normalstopimath \fi \@@cm::i:equilibrium ...\xrightpverleftarrow {}{}} \enspace l.10 \chemicalequilibrium \inlinechemical ...emicals.inline(\!!bs #1\!!es )} } l.3 \chemical{A,+,B,<->,AB} ? ___________________________________________________________________________________ If your question is of interest to others as well, please add an entry to the Wiki! maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context webpage : http://www.pragma-ade.nl / http://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________